TABLE 2

Demographics of participants in the retrospective cohort study (n=103)

VariableDistribution
Age# years (n=98)
 Mean±sd54.8±12.9
 Median (range (IQR))55.0 (67 (17))
Gender
 Male (n=65)63±9 (54–72)
 Female (n=36)35±9 (26–44)
Smoking status
 Never smoker (n=34)33±9 (24–42)
 Ex-smoker (n= 39)38±9 (29–47)
 Current smoker (n=16)16±7 (9–23)
Dust exposure
 Yes (n=35)34±9 (25–43)
 No (n=55)53±10 (43–63)
Disease severity score+
 1 (n=23)22±8 (14–30)
 2 (n=25)24±8 (16–32)
 3 (n=16)16±7 (8–23)
 4 (n=12)12±6 (6–18)
 5 (n=8)8±5 (3–13)
Symptoms
 Yes (n=62)60±10 (50–70)
 No (n=28)27±9 (18–36)
Complications
 Yes (n=35)34±9 (25–43)
 No (n=68)66±9 (57–75)

Data is presented as %±95% CI (lower–upper) unless otherwise stated. IQR: interquartile range. #: age at granulocyte-macrophage colony-stimulating factor autoantibody measurement; : dust exposure was based on self-reporting by patients/physicians; +: disease severity score was defined as described in the Methods section.